Feed and positive lock for clock-trains.



PELGATION FILED NOV. 5, 1908.

n, 1f w n, w

w. y M

9A u im FREDlCRlCK M. SCHMIDT, Oli BROOKLYN, NEW YORK, ASSIGNOR COMPANY, OFBROOKLYN, lilflll' YORK, A COlllOli/VllON ANS GSL'TEV LGCI FOR CLOCK-TRANS.

No. 919,619?. Specification o Letters Patent.

Patented April 2?', 1909.

Serial lo. 461,230.

To all whom n "may eoneern:

lle it known that l, Keramiek M. SCHMIDT, e cil-izen ol the Unied States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and use-ful' lniproremenis in Feeds and Positive Locks for vClock-Trains and the Like, el' which the following is a full and clear speciicalion, and the novel features ofA which are more particularly pointed out in the annexed claims.

My invention relates to a leerling and positive leeking'device for moving any kind well-known in the art. ln this particular' instance l have illust'r'ae'd in the aeco1n` panying drawings the eeding devieewperated eltrically and l have shown the device employedas an example in sci-called secondary clocks, such as are used in syn- ('.hronizinbf'v elock systems which are electrically controlled from a master clock.

ln the accompanying drawings Figure l a rear elevaiion of a secondary Clock train, such as above referred to, with 'the rear end plate removed. Fig. 2 is a plan View thereof. Fig. 3 is a rear elevation of the feeding' and locking device shown in Fig. l in a dil'- ferent position.

ln ltig l, l. is the minute arbor ol the clock which is turned by suilahl-e gearing Sironi shalt 41 (Fig. 2), on which the squaretoohed spur wheel 5 mounted, whieh eo operates with the feeding and lockingv meehanism. Feeding;Y wheel 5, as l shall call hereafter this square-toothed spur wheel, is normally prevented from rotating' in eilher direction hy means of looking pawl t3, pivoled at 7 in the clock frame, and held in engagemen with wheel 5 hy leall spring' 5%. Un pawl t3 is provided a nose il, lhe purpose of whieh will he desvrihed laici' on. lle- -reeiion, which is indiraen tween he two end plates lt) and ll (Fig. 2) is pivotally disposed rocking lever l2, the short end of which forms an armaure i3 cooperaing with electro magnet l-l. Lever l2 is spring-pressed hy mains of leaf sprin,Nl l5 and rests in its normal position against a slop 16 provided in the clock frame near armature. i3, with the armature withdrawn from the magnel. t ihe lree end of lever pivoted pawl li', suitably shaped at its end to engage between the teeth of feeding wheel 5. lawl 1T is held in engagement with these teeth hy means of leaf springl i8, fastened on lever l2 and hearing against the short` arm ol" pawl l?. A pin l?) is provided on the end plate lt (which is removed in Fig. l), which will prevent the end of pawl l? from becoming disengaged from wheel 5, should the spring pressure oi'leam spring` i8 he overcome hy some un foreseen cause.

On pawl 1T between its end and its pivot; point'. is provided a 'linger 20, which is slightly benlv upward oidI of alinement willi pawl l?, so lhat'. its end will he located near nose tl ot locking' pawl t3 wii'hou't, however, Coming in contact willi it in the position ,in which feeding pawl l'il is shown in Fig. l.

now, lever l2 is rocked into the position shown in Fig. :E hy energir/,ing eleot ro magnet 14, it will hevseen that pawl 17 has heen wih drawn one tooih of wheel 5 in its feeding dil by the arrow in Figs. l and and is held in engagement in this position with wheel 5 hy its spring lr, now, electro magnet l-i is again deiiner- Ai1/led, epring l5 will throw lever l2 hack into it: normal position (shown in `Fig. l), and during` this forward motion linger Q0 (which, in the position shown in llig. 3, hasthen just' passed nose i) and has been moved in line with it hy the opY ard movement el pawl l?) will, on 'he reurn srcke ol' lever l2, tri] locking' pawl t3 so tha it will release wheel 3 and allow liet-,dino` pawl l? lo l'eed il i'orward in the direction o the arrow. Sullieient lost motion is provided helween the end of pawl l? and its poiny of engagement on wheel 5, when in the position shown in Fie'. fl, so thati linger 2O will first trip pawl t? before pawl 17 commences iis feeding' stroke. llowever, #he relaiive position ol' nose 9 and linger 52() and th `r shapes are chosen so lhat the t'ripiiing T- pawl o will occur only iuslananeously an.. so ihat pawl lim T will be released from linger 20. before pawl i7 has'completed its feeding stroke. Thus l stroke pawl G will lock WheelJ o pawl (3, being again in engagement WithI wheel 5, will. th'stCi-ide on top of the following tooth and immediately fall into the following notch at the moment the feeding stroke of pawl i7 is completed. kt this moment feeding paivl l? has'again arrived at the position shown in Fig. l. lt will be clearly seen that thus an over-throw of feed- A ing wheel by too .strong a `feeding impulse of pawl 1T is impossible, and that wh el 5 will be moved one tooth only as desired. A stop pin Qt is provided at a suitable place on the clock frame for preventing pavvl (3 from being thrown too high in ease its springS shonld become weak. ln order to render the lockingl Wheel 5 in its normal position still more positive pin 1 9 (already referred. to above) is provided, which will, besides preventing paWl 1T from becoming disengaged from wheel ,5, also prevent a further rotation of wheel 5 in the direction of the arrow in case paivl (S should through some canse become disengaged and remain ont of engagement with wheel 5 because in this instance wheel 5, tending to rotate, would tend to throw paivl 1,7 downward, which is prevented by pin 19.

rlhe operation of the device is shortly as follows z-lVhen an electric impulse is transmitted to electro magnet ld from the master clock, armaturelof lever l) is attracted and thereby pawl 1T drawn one tootli back on feeding Wheel 5 and finger il() brought into line with nose S), The electric impulse, lioW- ever, being only instantaneous, armature 13 is immediately released, so that lever 12 upon its return stroke Will first unlock instantaneously wheel 5 by lifting pawl 6 and then cause pawl 17 to feed Wheel 5 one tooth. Upon the completion of the return again as described. y

While l have shown my novel feeding and i locking device in a particular structure for which I ind this mechanism most suitable, l do not ivish to limitI myself to this use of the mechanism alone, since it is obvious that this mechanism 'may be eniployed to the saine advantage in like devices vwhich should be normally locked and be fed step by step.

lVhat l claim istd l. In a step by step feeding device for clock trains and the like, the combination with a step by step operating feeding pawl, a toothed Wheel adapted to be fed by said pawl, and a spring-pressed locking pawl normally in positively locking engagement with said wheel; of a. finger integral With said feeding paivl adapted to disengage said locking pawl from the wheel at the beginning, and release it to retingage said Wheel before the completion of the feeding stroke.

2. -In a step by step feeding device for clock 'trains and the like,- in combination with a step by step operating spring-pressed feeding paWl and means for reeiprocatingly operating said pa'vvl, and a spring-pressed locking pavvl normally locking said wheel in either direction, having a nose, a linger iii-- tegral with said feeding pawl disposed adjacent to said nose to Ppass it at the idle stroke of said feeding pa wl and to trip it at the beginning of the feeding stroke of said paivl, tocause the disengagement of said locking pawl from said Wheel at the beginning and its` rengagement with it before the completion of the feeding stroke.

FREDERCK M. SCl'lUlDlA Witnesses:

M. LLFRED JANK, H. H. KNGHT. 

